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Table 4 Pearson correlation of measured 24-h urine sodium with spot urine sodium and predicted 24-h sodium from new equation models

From: Development and double cross-validation of new spot urine sodium equation to predict 24-h urine sodium in the Malaysian population

  24-h urine sodium (measured) P value
Spot urine sodium 0.219 < 0.001
New predicted 24-h urine sodium equation 0.501 < 0.001
Tanaka equation 0.232 < 0.001
INTERSALT equation 0.400 < 0.001